Liquefaction at lower pressures allows for safer and more efficient system operation as well as greater versatility in matching liquefier to experimental dewar pressure. Typical liquefaction is 24 l/day at 5.5 PSI [PAHL 200].

2. Separate Ports for Gas Input/Output

A separate gas port allows for very fine pressure adjustment without directly warming the refrigerator. The result is a more efficient liquid helium transfer.

3. Exclusive Integral (Built-In) Transfer Line

CRYO’s integral transfer line allows for simpler liquid helium transfers. Losses and complexities of inserting and removing the transfer line are eliminated. To quote a User:

“Transferring liquid helium from the PAHL200 is easier than transferring from a storage dewar”.

4. Shut-Off Loss Rate of Liquefier (Dewar) is Lower

Should the power be shut-off to the liquefier (i.e. in case of a power outage) and the refrigerator is turned off , the loss rate of the CRYO custom built dewar is extremely low (especially in the first 24 hours of refrigerator shut-down).

Loss rate of the Liquefier (Dewar) averaged over 24 hours is 0.075 l/hr

Loss rate of the Liquefier (Dewar) averaged over 72 hours is 0.280 l/hr

5. Very Efficient Duty Cycle

When in standby mode the system can be turned off for twelve hour periods with no loss of liquid helium.

6. Dewar Vacuum

The CRYO liquefier dewar requires no maintenance and no vacuum pumping for ten years or more!

7. Touch Panel Display and Stand-Alone Monitors

The system includes a touch-screen, removable Windows based tablet which displays system parameters. Additional separate stand-alone Liquid Helium level and temperature sensor monitors are included.